------------[ cut here ]------------
timer_delete_sync(&sdp->delay_work)
WARNING: kernel/rcu/srcutree.c:706 at cleanup_srcu_struct+0x3aa/0x890 kernel/rcu/srcutree.c:706, CPU#0: syz.4.393/7146
Modules linked in:
CPU: 0 UID: 0 PID: 7146 Comm: syz.4.393 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:cleanup_srcu_struct+0x3aa/0x890 kernel/rcu/srcutree.c:706
Code: 62 8a 00 48 83 7d 00 00 4c 8b 74 24 10 0f 85 dd 03 00 00 41 ff c5 41 83 e5 0f 41 83 fd 07 0f 86 0e ff ff ff e9 ab 00 00 00 90 <0f> 0b 90 4c 8d b5 00 02 00 00 4c 89 f3 48 c1 eb 03 48 b8 00 00 00
RSP: 0018:ffffc9000433fcf0 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000607edacffe40 RCX: ffffffff9a7aa501
RDX: 0000000000000001 RSI: ffffffff8e256ee9 RDI: 00000000ffffffff
RBP: ffffe8ffffc09e40 R08: ffffffff9059037f R09: 1ffffffff20b206f
R10: dffffc0000000000 R11: fffffbfff20b2070 R12: ffff888027186800
R13: 0000000000000000 R14: ffffffff8e5277d0 R15: 1ffffffff1ca4fde
FS:  00007ff9bad296c0(0000) GS:ffff888124f0a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9795b909c0 CR3: 000000007af0c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 blk_mq_free_tag_set+0x617/0x780 block/blk-mq.c:4976
 loop_remove+0x4e/0xc0 drivers/block/loop.c:2143
 loop_control_remove drivers/block/loop.c:2201 [inline]
 loop_control_ioctl+0x4a6/0x5a0 drivers/block/loop.c:2243
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff9b9d9e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff9bad29028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff9ba025fa0 RCX: 00007ff9b9d9e0d9
RDX: 0000000000000008 RSI: 0000000000004c81 RDI: 0000000000000006
RBP: 00007ff9b9e35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff9ba026038 R14: 00007ff9ba025fa0 R15: 00007ffd31953518
 </TASK>